My buddy Steve has a Go camera. It's been dropped, run over, submerged and hit whilest cycling, skiing and kayaking. He mounts either on top of his helmet or in a chest harness. It's a durable little sucker. Video quality seems good to me. Chest-mounted, it works well, on top of your brain bucket it's pretty tall compared to the bullet form factor IMHO. But no overhanging rocks or trees have broken it, a couple enough to knock him off the bike.
'91 Pickup - Imelda
'08 Tacoma TRD - Donna
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
"Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty. Nobody is able to achieve this completely, but the striving for such achievement is in itself a part of the liberation and a foundation for inner security. " --Albert Einstein